Level the load and improve the ride! With AirCell, Air-Lift's advanced no-maintenance load support you can reduce sag and improve the ride in heavily loaded vehicles. Made of rugged, long-lasting closed-cell urethane foam, the same material used in factory suspension parts. More durable, offers a better ride than rubber suspension kits, eliminating harsh jarring on rough roads. Great for one whose vehicle is always loaded, providing load support and ride quality at affordable prices. Lifetime warranty.